. Railroad freight transportation . method of hand operation by means Mifes(90,000 180,000170,000160,000(50,00014-0,000130,000120,,00090,,00060,00050,00040,00030,000£0,00010,000 IS o e s I <5 ^ 5; s; . ^ / / f A /fS ofh ait. ?oat Oh Ope. ■ofio 7(/n US. \ af- Tnd of ?ach yec r \ r omPc 930 „riA ■0 h 98 / / ) / / / 1 r J y / J / y ^ Mifes190,000 i8o,ooq 170,000/60,0Q0150,, llOfiOO100,,00070,00060,00050,00040,00030,000i0,O0(i io,ooCt B Fig. 11.—Miles of Railroad in Operation. of a so-called brake wheel is being supplanted by an im-pro
. Railroad freight transportation . method of hand operation by means Mifes(90,000 180,000170,000160,000(50,00014-0,000130,000120,,00090,,00060,00050,00040,00030,000£0,00010,000 IS o e s I <5 ^ 5; s; . ^ / / f A /fS ofh ait. ?oat Oh Ope. ■ofio 7(/n US. \ af- Tnd of ?ach yec r \ r omPc 930 „riA ■0 h 98 / / ) / / / 1 r J y / J / y ^ Mifes190,000 i8o,ooq 170,000/60,0Q0150,, llOfiOO100,,00070,00060,00050,00040,00030,000i0,O0(i io,ooCt B Fig. 11.—Miles of Railroad in Operation. of a so-called brake wheel is being supplanted by an im-proved drop handle design which can be operated by onehand, thereby permitting the brakeman, while standing onboth feet, to maintain a firm hold upon the grab-iron of thecar with his left hand. This improved method of operatinghand brakes presents many advantages as compared with 78 SHOPS AND EQUIPMENT the old hand wheel brake which was usually operated withia club. The operating parts of the improved brake, inelud- f600 1300. to 20 30 40 50 60 70 60 30 100 Ho. of Cars Fig. 12.—Engine Rating for One Per Cent Grade. ing the pawl, are fully enclosed in a caiiiig which preventssleet, cinders, snow and other material from interfering with THE PRESENT STATUS 79 operation in cold weather. The empty and load air brakeappliance establishes a closer relation between brakingpower and work to be performed. It will prove of greatervalue as the spread between the weights of the empty andloaded car is increased. The arch-bar truck was an essential type in the earlydays of railroading when most track was in what we wouldnow deem impossibly bad surface, and when much dependedupon it to accommodate the movement of the truck the modern heavy car trouble resulted from frequentbreakage and difficulty of maintenance. While this was dueto faulty processes and carelessness in manufacture ratherthan to type, the arch-bar truck does suffer from being anassembled structure. The effo
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Keywords: ., bookcentury1900, bookdecade1920, bookpublishernewyo, bookyear1922
